netadaptermessage.h

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/*
 * Copyright (c) 2016 - Adjacent Link LLC, Bridgewater, New Jersey
 * Copyright (c) 2008-2009 - DRS CenGen, LLC, Columbia, Maryland
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 * * Neither the name of DRS CenGen, LLC nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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 */

#ifndef EMANENETADAPTERMESSAGE_HEADER_
#define EMANENETADAPTERMESSAGE_HEADER_

#include <cstdint>

namespace EMANE
{
  const std::uint16_t NETADAPTER_DATA_MSG = 1;
  const std::uint16_t NETADAPTER_CTRL_MSG = 2;

  struct NetAdapterHeader
  {
    std::uint16_t u16Id_;     
    std::uint16_t u16Length_; 
    std::uint8_t  data_[0];   
  } __attribute__((packed));

  inline
  NetAdapterHeader * NetAdapterHeaderToHost(NetAdapterHeader * pMsg)
  {
    pMsg->u16Id_     =  ntohs(pMsg->u16Id_);
    pMsg->u16Length_ =  ntohs(pMsg->u16Length_);
    return pMsg;
  }

  inline
  NetAdapterHeader * NetAdapterHeaderToNet(NetAdapterHeader * pMsg)
  {
    pMsg->u16Id_     =  htons(pMsg->u16Id_);
    pMsg->u16Length_ =  htons(pMsg->u16Length_);
    return pMsg;
  }

  struct NetAdapterDataMessage
  {
    std::uint16_t u16Src_;
    std::uint16_t u16Dst_;
    std::uint16_t u16DataLen_;
    std::uint16_t u16CtrlLen_;
    std::uint8_t  u8Priority_;
    std::uint8_t  data_[0];
  } __attribute__((packed));

  struct NetAdapterControlMessage
  {
    std::uint16_t u16CtrlLen_;
    std::uint8_t data_[0];
  } __attribute__((packed));


  inline
  NetAdapterControlMessage * NetAdapterControlMessageToHost(NetAdapterControlMessage * ctrl)
  {
    ctrl->u16CtrlLen_ = ntohs(ctrl->u16CtrlLen_);
    return ctrl;
  }

  inline
  NetAdapterControlMessage *  NetAdapterControlMessageToNet(NetAdapterControlMessage * ctrl)
  {
    ctrl->u16CtrlLen_ = htons(ctrl->u16CtrlLen_);
    return ctrl;
  }

  inline
  NetAdapterDataMessage * NetAdapterDataMessageToHost(NetAdapterDataMessage * pkt)
  {
    pkt->u16Src_      = ntohs(pkt->u16Src_);
    pkt->u16Dst_      = ntohs(pkt->u16Dst_);
    pkt->u16DataLen_  = ntohs(pkt->u16DataLen_);
    pkt->u16CtrlLen_  = ntohs(pkt->u16CtrlLen_);

    return pkt;
  }

  inline
  NetAdapterDataMessage * NetAdapterDataMessageToNet(NetAdapterDataMessage * pkt)
  {
    pkt->u16Src_      = htons(pkt->u16Src_);
    pkt->u16Dst_      = htons(pkt->u16Dst_);
    pkt->u16DataLen_  = htons(pkt->u16DataLen_);
    pkt->u16CtrlLen_  = htons(pkt->u16CtrlLen_);

    return pkt;
  }


  const std::uint16_t NETADAPTER_BROADCAST_ADDRESS = 0xFFFF;
}

#endif //EMANENETADAPTERMESSAGE_HEADER_